Stackable display stand



FIG. 1 is a perspective view of a stackable display stand showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a stackable display stand, as shown. 